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Plasma or Serum Ferritin (Mass Concentration)

Published: August 9, 2026Updated: August 16, 2026

Ferritin is a protein that stores iron in your body. Your blood test measures the amount of ferritin in your plasma or serum to check for iron levels.

Quick summary

["This test helps assess iron stores and identify potential iron deficiency or iron overload."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
36070-1
Short code
MR Spleen
Synonyms
MR Spleen
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
mr
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Matters

Ferritin levels can indicate whether you have enough iron stored in your body. Low ferritin may suggest anemia or other health conditions, while high levels might point to iron overload, which can cause serious health problems if untreated.

Common Reasons for Testing

Your doctor may order a ferritin test if you have symptoms like fatigue, weakness, pale skin, or if they suspect anemia, chronic illness, or other conditions affecting iron metabolism.

Preparation for the Test

No special preparation is needed for this blood test. You may fast before the test, but your doctor will provide specific instructions if applicable.

What to Expect During the Test

A healthcare professional will draw blood from a vein in your arm. You may feel a slight pinch, but the process is quick and usually painless. You can resume normal activities immediately afterward.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Ferritin

Frequently asked questions

What does a low ferritin level mean?
A low ferritin level may indicate iron deficiency, which can lead to anemia. It could also be due to conditions like chronic blood loss, poor diet, or certain medications. Your doctor will discuss further steps, such as dietary changes or iron supplements, if needed.
What does a high ferritin level mean?
High ferritin levels can signal iron overload, often caused by genetic conditions like hemochromatosis. It may also be seen in chronic liver disease or certain cancers. Your doctor will evaluate your symptoms and other test results to determine the cause and recommend appropriate treatment.
Can ferritin levels change with diet?
Yes, diet can influence ferritin levels. Foods rich in iron (like lean meats, beans, and leafy greens) can affect iron absorption. However, ferritin is primarily a measure of stored iron, so diet alone may not always change ferritin levels significantly unless iron deficiency is present.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy